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Identification of Nutrient Deficiencies
Brian ArnallNutrient Management Extension
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Topics
• Deficiency ID with Pete Sheets
• Fertilizing on a Budget
• Fall applied litter
• Little and commercial fertilizer
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Nutrient Deficiency ID
• Where
• Color
• Pattern
• Soil
• Environment
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Old Growth
• Means the Nutrient is mobile in the Plant
• Nitrogen
• Phosphorus
• Potassium
• Magnesium
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Nitrogen DeficiencyNitrogen is mobile in the Plant : Lower/Older LeavesYellow from the tip toward the mid rib
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Phosphorus DeficiencyPhosphorus is mobile in the plant: Lower/Older Leaves
Purpling of the leaf margins or base of stems.Symptoms similar too…
Acidic soils
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Potassium DeficiencyPotassium is mobile in the plant: Lower/Older Leaves
Yellow starting at the tip advancing along the leaf marginsBrown Scorching along outer margins
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Magnesium DeficiencyMagnesium is mobile in the plant: Lower/Older Leaves
Yellowing between the veinsReddish Purple from leaf edge moving inward, cotton soybean canola
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New Growth
• Means the Nutrient is immobile in the Plant– Iron– Zinc– Manganese– Calcium– Boron– Sulfur– Copper– Chlorine– Molybdenum
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Iron DeficiencyIron is immobile in the plant: Upper/Newer leavesIntervienal chlorosis, stripes narrower than zinc and extend full length of leaf
Calcareous Soils pH >8
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Zinc DeficiencyZinc relatively immobile in plant: Upper/Newer leavesPurple margins, inward purple blotching, bleached bands on either side of midrib near base, intervienal chlorosisAcidic, Sandy soils, Calcareous pH>8
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Manganese DeficiencyManganese is relatively immobile in plant, but can move in xylem sap.Interveinal chlorosis, very similar to Fe, Mg, N. Severe deficiencies have brown specs and bronzing Limited at high pH, Calcareous soils.
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Boron DeficiencyBoron is immobile in the plant: Upper/Newer leavesWide range of symptoms; necrosis of young leaves and terminal buds, reddening in some legumes and canolaWell drained sandy soils
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Sulfur DeficiencySulfur is Immobile in the plant: Upper/Newer leaves.
Similar to nitrogen, yellowing more uniform over leaf. Intervienal Chlorosis.
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Sulfur is becoming more of a limiting nutrient in crop production than in the past, for several reasons: higher crop yields require more S; increased use of high analysis fertilizers containing little of no S; reduced amounts of atmospheric S fallout from the sky; and reduced soil S reserves from organic matter losses due to mineralization and erosion. Most S in the soil is tied up in organic matter and cannot be used by the plant until it is converted to the sulfate (SO4) form by soil bacteria. That process is known as mineralization. Sulfur can be applied as broadcast or banded fertilizer material or applied through irrigation systems (furrow and sprinkler). Sulfur is also an important nutrient for proper nutrition of forage crops that will be consumed by livestock
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Copper DeficiencyCopper is Immobile in the plant: Upper/Newer leavesStunted growth, terminal dieback, necrosis of meristem, delayed floweringNew leaves uniformly pale
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Chlorine DeficiencyChlorine is mobile in the plant: Lower/Older leaves
Reduced growth, necrotic and chlorotic spots, bronzing in extreme.
Upper leaves will wilt.
Sandy soils
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Molybdenum DeficiencyMolybdenum is readily translocated; whole plant
Related to N metabolism, yellowing, stunting, interveinal mottling
Cupping of upper leaves
Soil with low pH and high Fe and Al.
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Nutrient Deficiency
• Send in photos.
• At the end of the year awards go to the best.